Battery Maintenance
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Battery Maintenance
Ensuring Optimal Performance of Power Systems
To maintain the efficiency of your Uninterruptible Power Supply (UPS), Telecommunications 48V system, or generator, regular maintenance of lead-acid batteries is crucial. Regardless of the cost of your power protection system, whether it’s a standalone UPS or a standby diesel generator, batteries often emerge as the most frequent point of failure.
Common Battery Issues
Batteries might fail due to high resistance, leakage, or open circuits, leading to decreased autonomy or, in generators, failure to start. This can result in a loss of site load, requiring emergency intervention from an engineer.
Uninterruptible power supplies may contain internal batteries or use separate battery cabinets. Although manufacturers typically specify a design life of five to ten years for batteries, these estimates don't account for issues like intermittent spikes, brownouts, or voltage fluctuations, all of which can deplete battery life as they absorb these effects to protect sensitive systems.
Importance of Regular Checks
Even with a stated lifespan of up to ten years, batteries must be regularly checked to prevent premature failure. In a string of 32 blocks, a single battery with high impedance can render the entire string useless, leading to lost loads and system failures.
Visible signs of battery failure include casing splits due to leakage. However, issues like high impedance and open circuits require regular testing to detect.
Types of Batteries
Batteries generally fall into two categories: 'wet cells' and 'valve-regulated lead-acid' (VRLA) batteries, also known as sealed lead-acid batteries.
Wet Cell Batteries
Wet cell batteries often demand more maintenance, with the trade-off being a potentially longer life expectancy. Maintenance tasks include measuring specific gravity and topping up cells, along with regular visual inspections to address any drops in electrolyte levels.
VRLA Batteries
VRLA batteries, being sealed, are more challenging to assess. They often include a self-test feature, carried out automatically on a weekly or monthly basis. If the test fails, the system generates an alarm. However, if a UPS supports a small load compared to its capacity, the batteries might not be heavily utilized and could fail prematurely.
Reliable Testing Methods
Two reliable methods for regular battery testing are:
1. Capacity Testing: Loading the battery to one-third of its capacity to conduct a capacity test.
2. Impedance Testing: This non-intrusive method involves passing a known AC current through the battery and measuring the AC voltage to calculate impedance using Ohm's Law. These results can be compared with the manufacturer's recommendations, and consistent records will help establish a replacement schedule.
Conclusion
Whichever method you choose, regular battery maintenance is essential for any Uninterruptible Power Supply or generator standby power protection system.
PowerContinuity Means Business Continuity
For more information on uninterruptible power supplies, visit [PowerContinuity](http://www.powercontinuity.co.uk).
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